EP2341652A1 - Empfang von diversitätsgeschützten Datenflüssen in einem Funkkommunikationsnetzwerk - Google Patents

Empfang von diversitätsgeschützten Datenflüssen in einem Funkkommunikationsnetzwerk Download PDF

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Publication number
EP2341652A1
EP2341652A1 EP10305009A EP10305009A EP2341652A1 EP 2341652 A1 EP2341652 A1 EP 2341652A1 EP 10305009 A EP10305009 A EP 10305009A EP 10305009 A EP10305009 A EP 10305009A EP 2341652 A1 EP2341652 A1 EP 2341652A1
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Prior art keywords
data unit
data
data flow
decoding
parameter
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EP10305009A
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English (en)
French (fr)
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EP2341652B1 (de
Inventor
Stéphane Marques
Ahmed Lahrech
Philippe Perrault
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Alcatel Lucent SAS
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Alcatel Lucent SAS
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0045—Arrangements at the receiver end
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0057—Block codes

Definitions

  • the present invention generally relates to the field of radio communication networks.
  • the present invention relates to the reception of a diversity-protected data flow at a reception stage of a node of a radio communication network.
  • connection between two nodes of the network is implemented through a radio link carrying a data flow in the form of a radio signal between the two nodes.
  • the radio signal may be subjected to attenuation or fading, typically due to multipath propagation. These phenomena lead to a degradation of the radio signal. This degradation may cause the receiving node not to correctly retrieve the data flow from the radio signal. This increases the bit error rate (BER) of the data flow, and accordingly it degrades the radio link quality.
  • BER bit error rate
  • a diversity technique typically provides for the transmission of two or more radio signals carrying the same data flow between two nodes of a radio communication network.
  • the data flow is carried by two radio signals having two radio carriers with different frequency.
  • the data flow is carried by two radio signals that are received at the receiving node by two different reception antennas installed at a suitable mutual distance.
  • a node therefore receives two radio signals that carry the same data flow.
  • both the radio signals are processed to retrieve the original data flow.
  • a known technique for retrieving the original data flow is the Radio Protection Switching (RPS) technique.
  • RPS Radio Protection Switching
  • a reception stage of a node configured to implement the RPS technique typically comprises two reception antennas, two radio interfaces, two demodulators and two FEC (Forward Error Correction) decoders.
  • the two FEC decoders are connected to a frame aligner, a switch and a deframer.
  • the reception stage also comprises an RPS decision module. When two radio signals carrying the same data flow are received by the two reception antennas, they are demodulated so as to obtain two data flows that are then FEC decoded and aligned.
  • the RPS decision module is able to determine an information indicative of an average BER and/or of a mean square error of each of the two data flows and, according to such information, to drive the switch so as it forwards to the deframer (and then to further processing devices of the node) the data flow having the lower average BER and/or the lower mean square error.
  • the known RPS technique disadvantageously implies that, at any time, only one of the two data flows available at the output of the demodulators is exploited. Indeed, the switch selects only one of the two data flows (i.e. the one with the lower average BER and/or lower mean square error), whereas the other data flow is not exploited at all.
  • the two data flows exhibit a same average BER (or mean square error)
  • only one of them is processed.
  • the presence of the other data flow is not giving any benefit for improving the quality of the data flow output by the switch.
  • the RPS technique is intrinsically slow, since the switch is software-driven by the RPS decision module. Therefore, according to such technique, the switch may disadvantageously react to variations of the average BER (or mean square error) of the two data flows with a significant delay. Thus, it may happen that, for example, the switch outputs a data flow that previously had a lower average BER (or mean square error) than the other data flow, but that currently has a higher average BER (or mean square error).
  • the switching between the two data flows is not performed according to the current error conditions of the two data flows. Indeed, when one or more errors occur in a data flow, the effect of such one or more errors on its average BER arises with a certain delay. In other words, the average BER is disadvantageously not capable of providing a real-time indication of the error conditions of the two data flows.
  • a reception stage comprising a phase aligner, a combiner, in turn connected to a demodulator, a FEC decoder and a deframer.
  • the node receives the two radio signals, aligns their phases and combines them (for examples, it sums them) so as to obtain a single resulting radio signal. Downstream the combiner, the resulting radio signal is demodulated so as to obtain a data flow that is then decoded and further processed at the node.
  • the inventors have addressed the problem of providing a method for receiving a diversity-protected data flow at a reception stage of a node of a radio communication network, which overcomes the aforesaid drawbacks.
  • the inventors have addressed the problem of providing a method for receiving a diversity-protected data flow at a reception stage of a node of a radio communication network which is capable of exploiting both the received radio signals, which is faster that the known RPS technique, which is capable of reacting nearly simultaneously to possible errors and which is simple and substantially inexpensive to implement.
  • the expression "diversity-protected data flow” will designate a data flow transmitted by using a diversity technique, such as for instance the above cited frequency diversity technique and space diversity technique.
  • some embodiments of the present invention provide a method for receiving, at a reception stage of a node of a radio communication network, a diversity-protected data flow divided in data units coded according to a forward error correction code, the method comprising:
  • the diversity-protected data flow is divided in data units coded according to a block forward error correction code.
  • processing comprises:
  • step c) comprises:
  • step c) comprises:
  • the diversity-protected data flow is divided in data units coded according to a convolutional forward error correction code.
  • some embodiments of the present invention provide a reception stage for a node of a radio communication network configured to receive a diversity-protected data flow divided in data units coded according to a forward error correction code, the reception stage comprising:
  • some embodiments of the present invention provide a node for a communication network comprising a reception stage as set forth above.
  • some embodiments of the present invention provide a communication network comprising a node as set forth above.
  • Figure 1 shows a block diagram of a reception stage RX of a node of a radio communication network, according to a preferred embodiment of the present invention.
  • the reception stage RX is preferably configured to implement a diversity technique, preferably a space diversity technique.
  • the reception stage RX thus preferably comprises a first microwave antenna A1, a second microwave antenna A2, a first radio interface R11, a second radio interface R12, a first demodulator DM1, a second demodulator DM2, a first decoder DC1 and a second decoder DC2.
  • the first decoder DC1 and the second decoder DC2 are FEC decoders. More preferably, the first decoder DC1 and the second decoder DC2 are configured to perform a FEC decoding by means of an error correction code such as a block code, like a Reed Solomon code, a BCH code, an LDPC code (Low Density Parity Check), or a convolutional code.
  • an error correction code such as a block code, like a Reed Solomon code, a BCH code, an LDPC code (Low Density Parity Check), or a convolutional code.
  • the reception stage RX further comprises a frame aligner FA, a protection module PM and a deframer DF.
  • the protection module PM preferably comprises a switch S and a control unit CU.
  • the protection module PM is preferably a hardware module, more in particular an FPGA.
  • the first microwave antenna A1, the first radio interface R11, the first demodulator DM1 and the first decoder DC1 are connected in cascade.
  • the second microwave antenna A2, the second radio interface R12, the second demodulator DM2 and the second decoder DC2 are connected in cascade.
  • the first decoder DC1 and the second decoder DC2 are preferably connected to the frame aligner FA, which is in turn connected to the protection module PM.
  • the protection module PM is finally connected to the deframer DF.
  • the reception stage RX can comprise other components that are not shown in Figure 1 and that will not be described herein after, since they are not relevant for the present description.
  • reception stage RX receives, from a further node of the radio communication network (not shown in Figure 1 ), a first radio signal RS1 and a second radio signal RS2 which carry a same data flow.
  • the radio communication network is a packet-switched radio communication network.
  • the first radio signal RS1 and the second radio signal RS2 are then divided into frames.
  • Each frame is formatted according to the protocols implementing connectivity between the nodes of the radio communication network at layer 1 and layer 2 of the OSI model (e.g. Ethernet).
  • Each frame preferably comprises a header and a payload.
  • the data flow which is carried by the first radio signal RS1 and the second radio signal RS2 has been FEC coded at the node that generated the data flow by using a FEC code, e.g. a Reed Solomon code.
  • a FEC code e.g. a Reed Solomon code.
  • the first decoder DC1 and the second decoder DC2 of the reception stage RX are preferably configured to perform FEC decoding using the same FEC code, i.e. the same Reed Solomon code.
  • the first microwave antenna A1 and the second microwave A2 preferably detect the first radio signal RS1 and the second radio signal RS2, respectively.
  • the first microwave antenna A1 preferably forwards the first radio signal RS1 to the first radio interface R11, which in turn amplifies and filters the first radio signal RS1.
  • the first radio interface Rl1 then forwards the amplified and filtered first radio signal RS1 to the first demodulator DM1, which in turn demodulates the first radio signal RS1 thus obtaining a first data flow DF1.
  • the first demodulator DM1 preferably forwards such first data flow DF1 to the first decoder DC1.
  • the first decoder DC1 preferably performs a FEC decoding of the first data flow DF1.
  • such FEC decoding allows to correct possible errors inside the first data flow DF1.
  • the number of correctable errors at the first decoder DC1 depends on the error correction capability of the FEC code used.
  • the first decoder DC1 preferably generates first decoding information Dil which are indicative of the result of the FEC decoding operation at the first decoder DC1 (for example, the number of corrected errors, possible presence of non-correctable errors, etc.).
  • the second microwave antenna A2 forwards the second radio signal RS2 to the second radio interface R12, which in turn amplifies and filters the second radio signal RS2.
  • the second radio interface R12 then forwards the amplified and filtered second radio signal RS2 to the second demodulator DM2, which in turn demodulates the second radio signal RS2 thus obtaining a second data flow DF2.
  • the second demodulator DM2 preferably forwards such second data flow DF2 to the second decoder DC2.
  • the second decoder DC2 preferably performs a FEC decoding of the second data flow DF2.
  • such decoding allows to correct possible errors inside the second data flow DF2.
  • the number of correctable errors at the second decoder DC2 depends on the error correction capability of the FEC code used.
  • the second decoder DC2 preferably generates second decoding information D12 which are indicative of the result of the FEC decoding operation at the second decoder DC2 (for example, the number of corrected errors, possible presence of non-correctable errors, etc.).
  • the first and second decoders DC1 and DC2 then preferably forward the first decoded data flow DF1 and the second decoded data flow DF2, together with their respective first decoding information Dil and second decoding information D12, to the frame aligner FA.
  • the first decoding information Dil and the second decoding information D12 are embedded in the first decoded data flow DF1 and the second decoded data flow DF2, respectively, before transmission to the frame aligner FA.
  • the first decoding information Dil and the second decoding information D12 are transmitted to the frame aligner FA substantially in parallel to the first decoded data flow DF1 and the second decoded data flow DF2 on dedicated buses.
  • the frame aligner FA then preferably aligns frames of the first decoded data flow DF1 with corresponding frames of the second decoded data flow DF2. More in particular, the frame aligner FA preferably detects the starting point of each frame inside the first decoded data flow DF1 and the second decoded data flow DF2, and compensates for possible delays between corresponding frames by means of suitable delay circuits. The frame aligner FA then preferably sends the first aligned data flow DF1 and the second aligned data flow DF2, together with their respective first decoding information Dil and second decoding information D12, to the protection module PM.
  • the protection module PM preferably receives the first aligned data flow DF1 and the second aligned data flow DF2, together with their respective first decoding information Dl1 and second decoding information D12.
  • the protection module PM preferably extracts the first decoding information Dil and second decoding information D12 from the first aligned data flow DF1 and the second aligned data flow DF2.
  • the control unit CU preferably receives the first decoding information Dil and the second decoding information D12 while, substantially at the same time, the switch S receives the first aligned data flow DF1 and the second aligned data flow DF2.
  • first decoding information Dil and second decoding information D12 are transmitted on dedicated buses, no extraction is required.
  • the control unit CU preferably processes the first decoding information D11 l and the second decoding information D12 and, according to them, generates a decision information Decl. Then, the control unit CU preferably sends this decision information Decl to the switch S.
  • the switch S switches so as to output a retrieved data flow RDF which comprises data portions of the first data flow DF1 and/or data portions of the second data flow DF2, as it will be described in detail herein after.
  • the switch S preferably forwards the retrieved data flow RDF to the deframer DF.
  • the deframer DF preferably receives from the switch S the retrieved data flow RDF and terminates the frames of this retrieved data flow RDF, i.e. it eliminates the header from the frames and extracts the data contained in their payload.
  • the deframer DF then preferably forwards the retrieved data to other processing modules of the node, not shown in Figure 1 .
  • Figure 2 shows an exemplary flow chart illustrating in greater detail the operation of the first and second decoders DC1, DC2 and of the protection module PM, according to a preferred embodiment of the present invention.
  • the data flow which is carried by the first radio signal RS1 and the second radio signal RS2 has been FEC coded at the node that generated the data flow by using a FEC code.
  • FEC coding provides for adding redundancies data to a data flow.
  • FEC coding provides for dividing the data flow in data units, and coding each data unit (i.e. adding redundancy to each data unit).
  • the data unit is a block of a predefined size.
  • the data unit may be a single bit or a bit stream of arbitrary length.
  • the size of the data unit depends on the type of FEC code used.
  • the size of the data unit is preferably selected so that each frame of the data flow comprises in its payload a predefined number of FEC-coded data units.
  • first data flow DF1 and the second data flow DF2 provided by the first demodulator DM1 and the second demodulator DM2 comprise first frames (each comprising the predefined number of first FEC-coded data units) and second frames (each comprising the predefined number of second FEC-coded data units), respectively.
  • the first decoder DC1 preferably receives from the first demodulator DM1 a first data unit B1 of the first data flow DF1.
  • the second decoder DC2 preferably receives from the second demodulator DM2 a second data unit B2 of the second data flow DF2.
  • the first data unit B1 and the second data unit B2 are preferably corresponding data units, i.e. they comprise a same FEC-coded data portion of the original data flow.
  • the first decoder DC1 decodes the first data unit B1 and generates the first decoding information Dl1 which are indicative of the result of the FEC decoding performed on the first data unit B1.
  • the first decoding information Dl1 comprise, if the FEC code is a block code:
  • the first parameter MB1-x and the second parameter MB1-y described above are just exemplary. Indeed, according to the FEC code applied, other first decoding information Dil can be chosen which are indicative of the result of the FEC decoding.
  • the second decoder DC2 decodes the second data unit B2 and generates the second decoding information D12 which are indicative of the result of the FEC decoding performed on the second data unit B2.
  • the second decoding information Dl2 comprise a first parameter MB2-x and a second parameter MB2-y, whose meaning is identical to the meaning of the first and second parameters MB1-x and MB1-y described above.
  • the first decoder DC1 preferably forwards the first data unit B1 together with the first and second parameter MB1-x, MB1-y to the protection module PM through the frame aligner FA.
  • the first and second parameter MB1-x, MB1-y are inserted in a data unit header or data unit tag appended to the first data unit B1.
  • the first and second parameter MB1-x, MB1-y are forwarded to the protection module PM parallel to the first data unit B1 on a dedicated bus.
  • the second decoder DC2 preferably forwards the second data unit B2 together with the first and second parameters MB2-x, MB2-y to the protection module PM through the frame aligner FA.
  • the first and second parameter MB2-x, MB2-y are inserted in a data unit header or data unit tag appended to the second data unit B2.
  • the first and second parameter MB2-x, MB2-y are forwarded to the protection module PM parallel to the second data unit B2 on a dedicated bus.
  • the frame aligner FA preferably aligns the frames comprising the first data unit B1 and the second data unit B2, respectively. Therefore, downstream the frame aligner FA, the first data unit B1 and the second data unit B2 are aligned.
  • the protection module PM receives the parameters MB1-x, MB1-y and the parameters MB2-x, MB2-y. If the parameters MB1-x, MB1-y and the parameters MB2-x, MB2-y are inserted in a data unit header or data unit tag appended to the first data unit B1 and the second data unit B2, respectively, the protection module PM preferably extracts them from the first data unit B1 and the second data unit B2.
  • the switch S preferably receives the first data unit B1 and the second data unit B2 whereas, substantially at the same time, the control unit CU preferably receives the first parameters MB1-x, MB2-x and the second parameters MB1-y, MB2-y.
  • first parameters MB1-x, MB2-x and the second parameters MB1-y, MB2-y are transmitted on dedicated buses, no extraction is required.
  • the control unit CU preferably computes a first average AV1 of the value of the second parameter MB1-y associated to the currently received first data unit B1 and the values of the second parameter MB1-y associated to previously received data units of the first data flow DF1.
  • the control unit CU preferably computes a second average AV2 of the value of the second parameter MB2-y related to the second data unit B2 and the values of the second parameter MB2-y related to previously received data units of the second data flow DF2.
  • the first average AV1 and the second average AV2 indicate an average estimate of the number of errors contained in the first data flow DF1 and in the second data flow DF2, respectively, before the FEC decoding.
  • the first average AV1 and the second average AV2 are indicative of the quality of the first data flow DF1 and the second data flow DF2 as they are recovered by the first demodulator DM1 and the second demodulator DM2 starting from the first radio signal RS1 and the second radio signal RS2, respectively.
  • control unit CU preferably evaluates the first parameter MB1-x related to the first data unit B1 in order to assess whether the first decoded data unit B1 is erroneous (i.e. it contains one or more errors) (step 208).
  • a decision information Decl which operates the switch S to select the first data unit B1 and to forward it to the deframer DF (step 209), thus discarding the second data unit B2.
  • a decision information Decl which operates the switch S to select the second data unit B2 and to forward it to the deframer DF (step 211), thus discarding the first data unit B1.
  • the control unit CU determines that the first average AV1 is lower than the second average AV2 If, during step 212, the control unit CU determines that the first average AV1 is lower than the second average AV2, the control unit CU determines that, although both the first data unit B1 and the second data unit B2 are erroneous, the average number of errors affecting the first data flow DF1 before the FEC decoding up to the current time is lower than the average number of errors affecting the second data flow DF2 before the FEC decoding up to the current time. Accordingly, the control unit CU preferably performs step 209 described above, i.e. the control unit CU sends to the switch S a decision information Decl which operates the switch S to select the first data unit B1 and to forward it to the deframer DF, thus discarding the second data unit B2.
  • step 212 the control unit CU determines that the first average AV1 is higher than the second average AV2, it preferably performs step 211 described above, i.e. the control unit CU sends to the switch S a decision information which operates the switch S to select the second data unit B2 and to forward it to the deframer DF, thus discarding the first data unit B1.
  • the switch S outputs the data unit belonging to the data flow that, up to the current time, shows the better quality, i.e. the data flow that, on the average, has been affected by the lower number of errors.
  • steps 201-212 described above are repeated for each first data unit B1 and second data unit B2 received at the first and second decoders DC1, DC2, respectively.
  • the sequence of the data units selected and output by the switch S each time either step 209 or step 211 is performed advantageously forms the retrieved data flow RDF.
  • the method according to the present invention has been described with reference to a FEC block code such as a Reed Solomon code, this choice is not limiting, since the method just described can be implemented by applying any FEC code.
  • the FEC code is a convolutional code
  • the data units B1 and B2 comprise only a single bit.
  • decoding information are generated for each decoded bit.
  • the decoding information in this case, preferably comprise an information indicative of the bit reliability.
  • the method described above allows to obtain better performances with respect to the known RPS technique.
  • Figure 3 shows an exemplary diagram of two BER curves, as a function of the signal to noise ratio (SNR), of a diversity-protected data flow received by a reception stage implementing the known RPS technique and by the above described reception stage RX.
  • curve A is the BER curve of a diversity-protected data flow received by a reception stage implementing the known RPS technique
  • curve B is the BER curve of a diversity-protected data flow received by the reception stage RX.
  • the data flow was coded by an 8K LDPC FEC code.
  • the BER of the data flow received the reception stage RX is significantly lower than the BER of the data flow received by a reception stage implementing the known RPS technique, at least in a SNR range comprised between a minimum threshold THS corresponding to a BER (on curve A) equal to 10- 3 and the value THS + 1.5 dB.
  • THS minimum threshold
  • the SNR is 0.5 dB higher than THS
  • the BER decreases from 10- 6 (with a "normal" system) to 10- 10 (with the described technique). Since the minimum acceptable BER in a communication link is usually 10- 9 , this reduction of the BER allows to obtain a link with good performances.
  • the method described above is simple and substantially inexpensive to implement. Indeed, modifying the reception stage of a network node supporting the RPS technique so that it supports the method described above advantageously is a simple operation that substantially does not involve any additional cost.
  • the switching granularity of the method described above is finer with respect to the switching granularity of the known RPS technique.
  • the switching according to the known RPS technique is performed on the basis of an average BER estimate or mean square error
  • the switching according to the method of the present invention is performed on the basis of the decoding information related to each data unit.
  • the minimum switching period thus depends on the length of the data unit and on the bit rate. The shorter the code and the higher the bit rate, the finer is the switching granularity (i.e. the shorter the minimum switching period).
  • the switching period is advantageously a single bit period.
  • the inventors have estimated that the minimum switching period that can be achieved by applying the method according to embodiments of the present invention is of the order of tens of micro seconds.
  • this value is significantly lower than the minimum switching period achievable by the known RPS technique, which is of the order of milliseconds.
  • both the branches of the reception stage are exploited in a more efficient way.
  • This implies that an error appears in the retrieved data flow only if the same error appears simultaneously in the corresponding two data units which are processed in parallel at the reception stage.
  • the reception stage evaluates the average of the number of errors inside the two data flows (step 212 of Figure 2 ) and selects the data unit belonging to the data flow exhibiting the smaller average value. Nevertheless, advantageously, the noise figures of the two branches of the reception stage are uncorrelated, and therefore the probability of appearing of such an error simultaneously in the two data units is very low.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)
EP10305009.2A 2010-01-05 2010-01-05 Empfang von diversitätsgeschützten datenflüssen in einem funkkommunikationsnetzwerk Active EP2341652B1 (de)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4953197A (en) * 1988-12-08 1990-08-28 International Mobile Machines Corporation Combination spatial diversity system
EP1045543A2 (de) * 1999-04-15 2000-10-18 British Broadcasting Corporation Verfahren zum Diversity-Empfang und Diversity-Empfänger für OFDM-Signale
EP1235378A1 (de) 2000-09-07 2002-08-28 Sony Corporation Empfangseinrichtung für digitale funkdaten sowie verfahren

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8001445B2 (en) * 2007-08-13 2011-08-16 Provigent Ltd. Protected communication link with improved protection indication

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4953197A (en) * 1988-12-08 1990-08-28 International Mobile Machines Corporation Combination spatial diversity system
EP1045543A2 (de) * 1999-04-15 2000-10-18 British Broadcasting Corporation Verfahren zum Diversity-Empfang und Diversity-Empfänger für OFDM-Signale
EP1235378A1 (de) 2000-09-07 2002-08-28 Sony Corporation Empfangseinrichtung für digitale funkdaten sowie verfahren

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